Hach-Lange 1200-S sc - Manual (Page 23)

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Section 6 Maintenance
6.1 Maintenance schedule
The following table reflects experience and may, depending on the sector and
application, vary significantly from actual requirements.
You can set the calibration interval in the sensor setup. The controller then
reminds you when calibration is due.
6.2 Cleaning the sensor
Clean the sensor with a jet of water. If there is still soiling present, use a soft,
damp cloth.
6.3 Changing electrode
Change the electrode once a year or if the measurements are excessively
inaccurate despite cleaning and calibration.
1. Unscrew the protective cage from the tip of the sensor.
2. Pull out the electrode. If necessary, also lift out the base ring using a
screwdriver.
3. Undo the union nut on the connector and replace the electrode.
Fig. 6-1 Changing the electrode
Maintenance task 90 days annual
Clean sensor x
Check sensor for damage x
Renew sensor electrode
x
(depending on the application)
Calibration
(if necessary)
If necessary as per agreement with the authorities